/ Kalymnos Ferry with Van

Anyone done this?
Thinking of a road trip in our van through Europe, stopping in Kalymnos and renting an apartment there for a while.
I see you can get a ferry from Piraeus to Kaly, are there any (perhaps cheaper/ better) options?
Anyone got any tips?
I realise it might be quite rare for people to do this as most people fly and rent scooters (been there done that a long while ago!)